GSTDTAP  > 气候变化
DOI10.1007/s00382-017-3661-6
Variability and trends of wet season temperature in the Sudano-Sahelian zone and relationships with precipitation
Oueslati, Boutheina1; Camberlin, Pierre1; Zoungrana, Joel2; Roucou, Pascal1; Diallo, Saliou1
2018-02-01
发表期刊CLIMATE DYNAMICS
ISSN0930-7575
EISSN1432-0894
出版年2018
卷号50页码:1067-1090
文章类型Article
语种英语
国家France; Guinea Bissau
英文摘要

The relationships between precipitation and temperature in the central Sudano-Sahelian belt are investigated by analyzing 50 years (1959-2008) of observed temperature (Tx and Tn) and rainfall variations. At daily time-scale, both Tx and Tn show a marked decrease as a response to rainfall occurrence, with a strongest departure from normal 1 day after the rainfall event (-0.5 to -2.5 A degrees C depending on the month). The cooling is slightly larger when heavy rainfall events (> 5 mm) are considered. The temperature anomalies weaken after the rainfall event, but are still significant several days later. The physical mechanisms accounting for the temperature response to precipitation are analysed. The Tx drop is accounted for by reduced incoming solar radiation associated with increased cloud cover and increased surface evaporation following surface moistening. The effect of evaporation becomes dominant a few days after the rainfall event. The reduced daytime heat storage and the subsequent sensible heat flux result in a later negative Tn anomaly. The effect of rainfall variations on temperature is significant for long-term warming trends. The rainfall decrease experienced between 1959 and 2008 accounts for a rainy season Tx increase of 0.15 to 0.3 A degrees C, out of a total Tx increase of 1.3 to 1.5 A degrees C. These results have strong implications on the assessment of future temperature changes. The dampening or amplifying effects of precipitation are determined by the sign of future precipitation trends. Confidence on temperature changes under global warming partly depend on the robustness of precipitation projections.


英文关键词Rainfall Temperature Climate change Trends Sahel Burkina Faso
领域气候变化
收录类别SCI-E
WOS记录号WOS:000425328700019
WOS关键词SOIL-MOISTURE ; CLIMATE-CHANGE ; SURFACE-TEMPERATURE ; LAND-SURFACE ; HEAT WAVES ; EXTREMES ; IMPACT ; PROJECTIONS ; FEEDBACKS ; ENSEMBLE
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/35574
专题气候变化
作者单位1.Univ Bourgogne Franche Comte, CNRS, UMR 6282, Ctr Rech Climatol Biogeosci, F-21000 Dijon, France;
2.ASECNA, CP 806, Bissau, Guinea Bissau
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GB/T 7714
Oueslati, Boutheina,Camberlin, Pierre,Zoungrana, Joel,et al. Variability and trends of wet season temperature in the Sudano-Sahelian zone and relationships with precipitation[J]. CLIMATE DYNAMICS,2018,50:1067-1090.
APA Oueslati, Boutheina,Camberlin, Pierre,Zoungrana, Joel,Roucou, Pascal,&Diallo, Saliou.(2018).Variability and trends of wet season temperature in the Sudano-Sahelian zone and relationships with precipitation.CLIMATE DYNAMICS,50,1067-1090.
MLA Oueslati, Boutheina,et al."Variability and trends of wet season temperature in the Sudano-Sahelian zone and relationships with precipitation".CLIMATE DYNAMICS 50(2018):1067-1090.
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